{"id":8481,"date":"2020-04-17T15:59:03","date_gmt":"2020-04-17T03:59:03","guid":{"rendered":"https:\/\/www.greenpeace.org\/new-zealand\/?p=8481"},"modified":"2025-05-20T14:18:08","modified_gmt":"2025-05-20T02:18:08","slug":"polluted-drained-and-drying-out-new-warnings-on-new-zealands-rivers-and-lakes","status":"publish","type":"post","link":"https:\/\/www.greenpeace.org\/aotearoa\/story\/polluted-drained-and-drying-out-new-warnings-on-new-zealands-rivers-and-lakes\/","title":{"rendered":"Polluted, drained, and drying out: new warnings on New Zealand&#8217;s rivers and lakes"},"content":{"rendered":"\n<p>The <a href=\"https:\/\/www.mfe.govt.nz\/publications\/environmental-reporting\/our-freshwater-2020\">latest environmental report<\/a> on New Zealand\u2019s lakes and rivers reiterates bleak news about the state of freshwater ecosystems, and warns that climate change will exacerbate existing threats.<\/p>\n\n<p>Almost all New Zealand rivers running through urban and farming areas (95-99%) carry pollution above water quality guidelines, while most of the nation\u2019s wetlands (90%) have been drained, and many freshwater fish species (76%) are threatened or at risk. <\/p>\n\n<p>The most significant pressures on freshwater ecosystems fit into four issues:<\/p>\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/images.theconversation.com\/files\/328229\/original\/file-20200415-140715-1df6qhb.jpg?ixlib=rb-1.1.0&amp;q=45&amp;auto=format&amp;w=754&amp;fit=clip\" alt=\"\"\/><figcaption class=\"wp-element-caption\">\n              <span class=\"caption\"><\/span>\n              <span class=\"attribution\"><span class=\"source\">Ministry for the Environment\/Stats NZ<\/span>, <a class=\"license\" href=\"http:\/\/creativecommons.org\/licenses\/by-sa\/4.0\/\">CC BY-SA<\/a><\/span>\n            <\/figcaption><\/figure>\n\n<p>Climate change gets more attention than in earlier assessments, reflecting the fact that glaciers are already shrinking and soils are drying out. <\/p>\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n<p>\n  <em>\n    <strong>\n      Read more:\n      <a href=\"https:\/\/theconversation.com\/new-zealands-urban-freshwater-is-improving-but-a-major-report-reveals-huge-gaps-in-our-knowledge-115695\">New Zealand\u2019s urban freshwater is improving, but a major report reveals huge gaps in our knowledge<\/a>\n    <\/strong>\n  <\/em>\n<\/p>\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n<h2 class=\"wp-block-heading\" id=\"h-what-whitebait-tell-us-about-freshwater-fish-under-stress\">What whitebait tell us about freshwater fish under stress<\/h2>\n\n<p>The latest assessment is an update on a <a href=\"https:\/\/www.mfe.govt.nz\/publications\/environmental-reporting\/our-fresh-water-2017\">freshwater report in 2017<\/a> and the comprehensive <a href=\"https:\/\/www.mfe.govt.nz\/environment-aotearoa-2019\">Environment Aotearoa 2019<\/a>. It reiterates issues we\u2019ve seen before, but begins to implement <a href=\"https:\/\/www.pce.parliament.nz\/publications\/focusing-aotearoa-new-zealand-s-environmental-reporting-system\">recent recommendations<\/a> by the Parliamentary Commissioner for the Environment (<a href=\"https:\/\/www.pce.parliament.nz\/\">PCE<\/a>) calling for a stronger link between data and environmental management.<\/p>\n\n<p>Biological impacts are at the forefront of this latest assessment. It shows that a wide range of freshwater organisms are at risk. The statistics for freshwater fish are the most concerning, with three quarters of the 51 native species already either threatened or at risk of extinction. <\/p>\n\n<p>The report uses a particular group of native fish (\u012bnanga, or galaxids) to connect the multiple impacts humans have, across a range of habitats at different life stages. <\/p>\n\n<p>\u012ananga are better known as whitebait, a delicacy that is a <a href=\"https:\/\/www.doc.govt.nz\/nature\/native-animals\/freshwater-fish\/whitebait-migratory-galaxiids\/\">mix of juveniles from six different species<\/a> caught as they migrate from the sea to rivers.<\/p>\n\n<p>\u012ananga of different ages and species live in different habitats, so they can be used to represent the issues facing a range of freshwater fish across ecosystems. The main stress factors include altered habitat, pollution and excess nutrients, water use for irrigation and climate change.  <\/p>\n\n<p>Climate change is expected to exacerbate existing stresses native organisms like \u012bnanga face and protecting their habitat means understanding how much it will reduce water flows and create hotter and drier conditions. <\/p>\n\n<h2 class=\"wp-block-heading\" id=\"h-filling-gaps-in-understanding\">Filling gaps in understanding<\/h2>\n\n<p>The use of organisms to assess environmental change, including climate change impacts, is an obvious but important step. It makes it possible to consider climate change in a way that meets the <a href=\"http:\/\/www.legislation.govt.nz\/act\/public\/2015\/0087\/latest\/DLM5941105.html\">Environmental Reporting Act<\/a>\u2019s requirement to report on a \u201cbody of evidence\u201d. <\/p>\n\n<p>This latest report responds to the PCE\u2019s concerns about gaps in our knowledge, which were raised in the <a href=\"https:\/\/theconversation.com\/new-zealands-urban-freshwater-is-improving-but-a-major-report-reveals-huge-gaps-in-our-knowledge-115695\">Environment Aotearoa 2019 assessment<\/a>. The new strategy for filling large holes in our knowledge has three priorities: knowing and monitoring what we have, what we may lose, and where or how we can make changes. <\/p>\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n<p>\n  <em>\n    <strong>\n      Read more:\n      <a href=\"https:\/\/theconversation.com\/six-ways-to-improve-water-quality-in-new-zealands-lakes-and-rivers-95049\">Six ways to improve water quality in New Zealand&#8217;s lakes and rivers<\/a>\n    <\/strong>\n  <\/em>\n<\/p>\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n<p>The report highlights that m\u0101tauranga M\u0101ori, the process of using indigenous knowledge about the environment, can fill some gaps in data or add insights. Other methods and models, such as <a href=\"https:\/\/www.tandfonline.com\/doi\/abs\/10.1080\/03014220809510547\">nutrient budget scenarios<\/a>, also deserve consideration. <\/p>\n\n<p>There is some good news as well. Some pollution concerns may be minor or limited to very small areas. This includes several so-called emerging contaminants, such as <a href=\"https:\/\/www.mfe.govt.nz\/land\/pfas-and-poly-fluoroalkyl-substances\/pfospfoa-nz\">fire retardants<\/a>, which have been discovered in groundwater around airfields but are now banned or restricted.  <\/p>\n\n<p>The second piece of good news is that new ways of studying the environment can help fill major gaps. For example, lakes may be more stable indicators of freshwater health than rivers and streams, but only 4% (about 150) of New Zealand\u2019s 3,820 larger lakes are regularly monitored by regional councils. <\/p>\n\n<p>For almost 300 lakes, the report includes an index of the plants that live in them, and for more than 3000 there is now an established method of estimating lake water quality. Further information is becoming available, using updated <a href=\"https:\/\/doi.org\/10.1080\/00288330.2020.1726974\">estimations<\/a>, <a href=\"https:\/\/www.mdpi.com\/2072-4292\/10\/8\/1273\">satellite data<\/a> for the last 20 years and <a href=\"https:\/\/lakes380.com\">sediment cores<\/a> to reconstruct environmental conditions over the last few hundred years.<\/p>\n\n<p>Unfortunately, the data from lakes confirms the general trend of freshwater decline, but at least the multiple forms of complementary information should help us to manage New Zealand\u2019s freshwater ecosystems better.<!-- Below is The Conversation's page counter tag. Please DO NOT REMOVE. --><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/counter.theconversation.com\/content\/136486\/count.gif?distributor=republish-lightbox-basic\" alt=\"The Conversation\" width=\"1\" height=\"1\" style=\"border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important; text-shadow: none !important\"><!-- End of code. If you don't see any code above, please get new code from the Advanced tab after you click the republish button. The page counter does not collect any personal data. More info: https:\/\/theconversation.com\/republishing-guidelines --><\/p>\n\n<p><span><a href=\"https:\/\/theconversation.com\/profiles\/troy-baisden-459727\">Troy Baisden<\/a>, Professor and Chair in Lake and Freshwater Sciences, <em><a href=\"https:\/\/theconversation.com\/institutions\/university-of-waikato-781\">University of Waikato<\/a><\/em><\/span><\/p>\n\n<p>This article is republished from <a href=\"https:\/\/theconversation.com\">The Conversation<\/a> under a Creative Commons license. Read the <a href=\"https:\/\/theconversation.com\/polluted-drained-and-drying-out-new-warnings-on-new-zealands-rivers-and-lakes-136486\">original article<\/a>.<\/p>\n<div class=\"EmptyMessage\">Block content is empty. Check the block&#8217;s settings or remove it.<\/div>\n<p class=\"has-beige-100-background-color has-background has-medium-font-size\">This article\u00a0is a guest post and doesn&#8217;t necessarily represent the views of Greenpeace.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Shutterstock The latest environmental report on New Zealand\u2019s lakes and rivers reiterates bleak news about the state of freshwater ecosystems, and warns that climate change will exacerbate existing threats. Almost&hellip;<\/p>\n","protected":false},"author":6,"featured_media":2268,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_planet4_optimize_post_is_variant":false,"_planet4_optimize_experiment_name":"","_planet4_optimize_variant_name":"","ep_exclude_from_search":false,"p4_og_title":"Polluted, drained, and drying out: new warnings on New Zealand's rivers and lakes","p4_og_description":"","p4_og_image":"","p4_og_image_id":"","p4_seo_canonical_url":"","p4_campaign_name":"not set","p4_local_project":"not set","p4_basket_name":"not set","p4_department":"","footnotes":""},"categories":[10],"tags":[19,22],"p4-page-type":[6],"class_list":["post-8481","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-greenpeace","tag-food-and-farming","tag-freshwater","p4-page-type-story"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.8 (Yoast SEO v26.8) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Polluted, drained, and drying out: new warnings on New Zealand&#039;s rivers and lakes<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.greenpeace.org\/aotearoa\/story\/polluted-drained-and-drying-out-new-warnings-on-new-zealands-rivers-and-lakes\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Polluted, drained, and drying out: new warnings on New Zealand&#039;s rivers and lakes\" \/>\n<meta property=\"og:description\" content=\"Shutterstock The latest environmental report on New Zealand\u2019s lakes and rivers reiterates bleak news about the state of freshwater ecosystems, and warns that climate change will exacerbate existing threats. 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